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-rw-r--r--dgbuilder/red/settings.js84
1 files changed, 84 insertions, 0 deletions
diff --git a/dgbuilder/red/settings.js b/dgbuilder/red/settings.js
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+++ b/dgbuilder/red/settings.js
@@ -0,0 +1,84 @@
+/**
+ * Copyright 2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+var when = require("when");
+
+var assert = require("assert");
+
+var userSettings = null;
+var globalSettings = null;
+var storage = null;
+
+var persistentSettings = {
+ init: function(settings) {
+ userSettings = settings;
+
+ for (var i in settings) {
+ if (settings.hasOwnProperty(i)) {
+ (function() {
+ var j = i;
+ persistentSettings.__defineGetter__(j,function() { return userSettings[j]; });
+ persistentSettings.__defineSetter__(j,function() { throw new Error("Property '"+i+"' is read-only"); });
+ })();
+ }
+ }
+ globalSettings = null;
+ },
+ load: function(_storage) {
+ storage = _storage;
+ return storage.getSettings().then(function(_settings) {
+ globalSettings = _settings;
+ });
+ },
+ get: function(prop) {
+ if (userSettings.hasOwnProperty(prop)) {
+ return userSettings[prop];
+ }
+ if (globalSettings === null) {
+ throw new Error("Settings not available");
+ }
+ return globalSettings[prop];
+ },
+
+ set: function(prop,value) {
+ if (userSettings.hasOwnProperty(prop)) {
+ throw new Error("Property '"+prop+"' is read-only");
+ }
+ if (globalSettings === null) {
+ throw new Error("Settings not available");
+ }
+ var current = globalSettings[prop];
+ globalSettings[prop] = value;
+ try {
+ assert.deepEqual(current,value);
+ return when.resolve();
+ } catch(err) {
+ return storage.saveSettings(globalSettings);
+ }
+ },
+
+ available: function() {
+ return (globalSettings !== null);
+ },
+
+ reset: function() {
+ userSettings = null;
+ globalSettings = null;
+ storage = null;
+ }
+}
+
+module.exports = persistentSettings;